Configuration Handbook - Kamami.pl

Device Configuration PinsTable 11–15. Dedicated Configuration Pins on the Stratix III Device (Part 4 of 7)Pin Name User Mode ConfigurationSchemenSTATUS(continued)Pin TypeDescription— — — If V CCPGM and V CCIO are not fully powered up,the following could occur:■ V CCPGM and V CCIO are powered highenough for the nSTATUS buffer tofunction properly, and nSTATUS isdriven low. When V CCPGM and V CCIOare ramped up, POR trips andnSTATUS is released after PORexpires.■ V CCPGM and V CCIO are not poweredhigh enough for the nSTATUS bufferto function properly. In thissituation, nSTATUS might appearlogic high, triggering aconfiguration attempt that wouldfail because POR did not yet trip.When V CCPD and V CCIO are poweredup, nSTATUS is pulled low becausePOR did not yet trip. When PORtrips after V CCPGM and V CCIO arepowered up, nSTATUS is releasedand pulled high. At that point,reconfiguration is triggered and thedevice is configured.11–78 Altera CorporationStratix III Device Handbook, Volume 1 May 2007